2d+21=5d

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Solution for 2d+21=5d equation: 



2d+21=5d

We move all terms to the left:

2d+21-(5d)=0

We add all the numbers together, and all the variables

-3d+21=0

We move all terms containing d to the left, all other terms to the right

-3d=-21

d=-21/-3

d=+7

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